One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,16)(12,15)(13,14)(17,18)(19,29)(20,28)(21,32)(22,25)(23,26)(24,30)(27,31) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,10)(11,16)(12,15)(13,14)(17,19,22,30,23,21,20,31)(18,24,28,29,26,27,25,32)(1,3,4,7)(2,5,6,8)(10,14)(15,16)(17,20,23,22)(18,25,26,28)(19,30,21,31)(24,29,27,32)(2,6)(5,8)(9,11,13,12)(10,15,14,16)(18,26)(19,21)(25,28)(30,31)(9,12,13,11)(10,15,14,16)(17,21,22,31,23,19,20,30)(18,27,28,32,26,24,25,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.